Exploit/Advisories

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Ubuntu Security Notice USN-6183-1
June 21, 2023

bind9 vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 23.04
- Ubuntu 22.10
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in Bind.

Software Description:
- bind9: Internet Domain Name Server

Details:

Shoham Danino, Anat Bremler-Barr, Yehuda Afek, and Yuval Shavitt discovered
that Bind incorrectly handled the cache size limit. A remote attacker could
possibly use this issue to consume memory, leading to a denial of service.
(CVE-2023-2828)

It was discovered that Bind incorrectly handled the recursive-clients
quota. A remote attacker could possibly use this issue to cause Bind to
crash, resulting in a denial of service. This issue only affected Ubuntu
22.04 LTS, Ubuntu 22.10, and Ubuntu 23.04. (CVE-2023-2911)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 23.04:
bind9 1:9.18.12-1ubuntu1.1

Ubuntu 22.10:
bind9 1:9.18.12-0ubuntu0.22.10.2

Ubuntu 22.04 LTS:
bind9 1:9.18.12-0ubuntu0.22.04.2

Ubuntu 20.04 LTS:
bind9 1:9.16.1-0ubuntu2.15

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-6183-1
CVE-2023-2828, CVE-2023-2911

Package Information:
https://launchpad.net/ubuntu/+source/bind9/1:9.18.12-1ubuntu1.1
https://launchpad.net/ubuntu/+source/bind9/1:9.18.12-0ubuntu0.22.10.2
https://launchpad.net/ubuntu/+source/bind9/1:9.18.12-0ubuntu0.22.04.2
https://launchpad.net/ubuntu/+source/bind9/1:9.16.1-0ubuntu2.15

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